EP 1391841 A4 20040728 - METHOD FOR PRODUCING AND VISUALISING AN OPTICALLY INVISIBLE MARK
Title (en)
METHOD FOR PRODUCING AND VISUALISING AN OPTICALLY INVISIBLE MARK
Title (de)
VERFAHREN ZUM HERSTELLEN UND VISUALISIEREN EINER OPTISCH UNSICHTBAREN MARKIERUNG
Title (fr)
PROCEDE DE FORMATION ET DE VISUALISATION D'UNE MARQUE OPTIQUEMENT INVISIBLE
Publication
Application
Priority
RU 0100177 W 20010426
Abstract (en)
[origin: EP1391841A1] This invention relates to methods of writing and reading information hidden from visual observation and may be used for visualizing hidden images (marks) identifying an object, which provide protection from unauthorized reproduction (forgery). The method of creation and visualization of an optically invisible mark consists in the following. On the surface of the object in question an optically invisible marking image is formed by means of modification of, at least one part of said surface, after which visualization of said image is established. Prior to formation of the optically invisible marking image the surface of the object in question (carrying the applied image) is made into a mirror. Modification is achieved by changing the surface energy of the parts being modified. In addition the visualization of the optically invisible marking image is achieved by means of establishing in the area of said surface of the object in question a meta-stable environment, by means of which the visually observed image of the optically invisible mark is obtained as differences of the structures, which are formed by particles of the stable phase of the meta-stable environment, on parts of the surface (of the object in question) with different surface energy. Different variants regarding the use of meta-stable environments, as well as methods of formation, on the surface of an object in question, of an optically invisible marking image are provided.
IPC 1-7
IPC 8 full level
G07D 7/12 (2006.01)
CPC (source: EP US)
G07D 7/0032 (2017.04 - EP US)
Citation (search report)
- [DA] US 4467172 A 19840821 - EHRENWALD JERRY [US], et al
- [A] US 5573684 A 19961112 - WINSTON RONALD H [US], et al
- [A] US 5753887 A 19980519 - ROSENWASSER JOEL [US], et al
- [A] GB 2325392 A 19981125 - GERSAN ETS [LI]
- [A] GB 2332651 A 19990630 - GERSAN ETS [LI]
- See references of WO 02089041A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1391841 A1 20040225; EP 1391841 A4 20040728; CA 2445443 A1 20021107; CA 2445443 C 20130108; CN 1258734 C 20060607; CN 1522422 A 20040818; HK 1068435 A1 20050429; US 2004126703 A1 20040701; US 6905725 B2 20050614; WO 02089041 A1 20021107
DOCDB simple family (application)
EP 01954549 A 20010426; CA 2445443 A 20010426; CN 01823419 A 20010426; HK 05100351 A 20050113; RU 0100177 W 20010426; US 47593503 A 20031027